Note: This seems to be some sort of state issue with button active effect. Sometimes it works, sometimes it does not, both the active visual effect or what happens on the button press (they do not seem to be connected)

1) Either there is a genuine bug with the button active and disabled state
2) The logic what should happen when pressing these buttons has too complex and unínituive logic to be understood

Tooltips might help?
Nothing happens OR Left arrow button greyed out effect is removed when navigating to a new folder